Constructs a new IntegerSpinnerValueFactory with a default amountToStepBy of one.

Parameters:

min     The minimum allowed integer value for the Spinner.

max     The maximum allowed integer value for the Spinner.

initialValue     The value of the Spinner when first instantiated, must be within the bounds of the min and max arguments, or else the min value will be used.

`min`		The minimum allowed integer value for the Spinner.
`max`		The maximum allowed integer value for the Spinner.
`initialValue`		The value of the Spinner when first instantiated, must be within the bounds of the min and max arguments, or else the min value will be used.